EP2853860B1 - Method and device for assisted piloting of an aircraft during a parabolic flight intended for generating weightlessness in the aircraft - Google Patents

Description

The present invention relates to a method and a device for assisting the piloting of an aircraft during a parabolic flight in order to generate a weightlessness in the aircraft.

It is known that weightlessness corresponds to a situation of absence of gravity and represents the state of a body, in particular of a human body, which is such that the set of gravitational and inertial forces to which it is subjected possesses a resultant and a resulting moment null.

Since the beginning of the conquest of space, the need to reconstruct conditions of weightlessness has been met by the completion of specific flights of civil transport aircraft arranged for this purpose. It is indeed possible to obtain conditions of weightlessness, generally for about twenty seconds, inside an airliner, by bringing the latter on a parabolic trajectory. This method has been used for many years for the training of astronauts, and also for the realization of scientific experiments requiring conditions of weightlessness.

The piloting of an airplane on such a parabolic trajectory is delicate essentially on the pitch axis, the roll axis being only controlled to maintain the inclination zero.

On the pitch axis, to help the pilot obtain the weightlessness condition, he is generally provided with an indication of the vertical load factor. This vertical load factor is represented on a dedicated instrument by means of a linear scale provided with graduations, on which is marked a point of cancellation of the load factor.

If the indicated load factor is greater than 0 then the pilot must push on the stick. If it is less than 0, the pilot must pull the stick.

This technique is relatively effective and provides satisfactory results in most cases with a well trained crew.

However, it has a disadvantage. Indeed, on an aircraft of usual architecture, that is to say equipped with a rear horizontal stabilizer, the elevator has a direct reverse action of the desired effect by the pilot. If, for example, the driver sees that the load factor is slightly positive, he will push on the stick. This action has the effect of deflecting the elevator down. This steering of the elevator provides an increase in lift of the rear horizontal stabilizer, the main effect of which is the creation of a moment to stitch at the center of gravity. This moment generates a negative pitch acceleration, integrated in a negative pitch speed itself integrated into a reduction of the attitude, which leads to a reduction of the incidence and thus ultimately a reduction of the lift and thus a reduction of the factor load, which was the initial intention of the pilot. However, this reduction of the load factor is obtained after a double integration. There is a lower but more immediate elevator steering effect: the increase in the lift of the horizontal stabilizer in the example of a pilot pushing on the stick, creates overall on the aircraft and transiently an increase in the lift and therefore an increase in the load factor. Therefore, a driver who pushes on the handle to reduce the load factor will, transiently, create an increase in the load factor, low but clearly visible. The opposite effect occurs if the pilot pulls on his stick in case he wants to increase the load factor.

1. a) il va être nécessaire que le pilote soit bien entraîné pour être capable de piloter avec une sorte de précommande sans se préoccuper de l'effet initial de son action sur le manche ; et
2. b) en cas de perturbations atmosphériques, le pilote tentera de compenser les fluctuations du facteur de charge qu'il constate sur son indicateur, ne sachant pas si elles proviennent d'un effet extérieur ou de sa propre action. Et chacune de ses actions aura pour effet de dégrader la qualité de l'impesanteur, en particulier à l'arrière de la cabine.

This indirect effect of the elevator has two main consequences on the quality of the weightlessness obtained in the aircraft:

1. a) It will be necessary for the pilot to be well trained to be able to drive with a sort of pre-order without worrying about the initial effect of his action on the stick; and
2. (b) in the event of atmospheric disturbances, the pilot will attempt to compensate for fluctuations in the load factor that he observes on his indicator, not knowing whether they come from an external effect or from his own action. And each of its actions will have the effect of degrading the quality of weightlessness, especially at the back of the cabin.

Moreover, we know from the document US - 5,971,319 a system for quickly reconfiguring an aircraft from a cargo or passenger configuration into a parabolic flight configuration. This usual system provides calculate a handle setpoint for a parabolic flight, and display current and predicted symbols to help a pilot perform the parabolic flight.

The present invention aims to remedy the aforementioned drawback. It relates to a method of assisting the piloting of an aircraft during a parabolic flight in order to generate a weightlessness in the aircraft, which makes it possible to provide assistance to the pilot so that he knows at all times, so as to direct and immediate, what action or order it must apply on his sleeve, and thus minimize parasitic actions that degrade the quality of weightlessness.

1. a) à calculer une consigne de manche correspondant à une position optimale courante du manche pour réaliser le vol parabolique ;
2. b) à déterminer une position effective (c'est-à-dire réelle) courante du manche ; et
3. c) à présenter simultanément, sur au moins une échelle de positions de manche, affichée sur un écran du poste de pilotage :
   • un premier indicateur représentatif de ladite consigne de manche, calculée à l'étape a) ; et
   • un second indicateur représentatif de ladite position effective courante du manche, déterminée à l'étape b).

For this purpose, according to the invention, said method of assisting the piloting of an aircraft during a parabolic flight to generate a weightlessness in the aircraft, said aircraft comprising a handle adapted to be actuated by a pilot for modify its position and configured to act on at least one elevator to generate control of the aircraft on the pitch axis according to the position of said handle,
is remarkable in that it comprises a series of steps, implemented automatically and repetitively, during a parabolic flight of the aircraft and consisting in real time:

1. a) calculating a stick setpoint corresponding to a current optimum position of the stick to perform the parabolic flight;
2. b) determining a current effective (i.e. actual) position of the handle; and
3. (c) to display simultaneously, on at least one ladder of stick positions, displayed on a cockpit screen:
   • a first indicator representative of said stick setpoint, calculated in step a); and
   • a second indicator representative of said current effective position of the handle, determined in step b).

Thus, thanks to the invention, the handle setpoint (which illustrates an optimal position of the handle to fly the aircraft on a parabolic flight to create a weightlessness) is calculated in real time and is adapted to the current situation of the aircraft. aircraft, during the flight. This stick setpoint is supplied to the pilot via the first indicator, which thus indicates to the pilot at all times, the position where the handle must be achieve optimal control of the aircraft. Said stick setpoint depends solely on the speed and the longitudinal attitude, as specified below, it is almost insensitive to atmospheric disturbances and is not dependent on the quality of the measurement of the load factor.

Therefore, the present invention provides an aid to the pilot by indicating in real time, in a direct way, what action it must apply on its handle to perform the parabolic flight, thus minimizing parasitic actions that degrade the quality of the weightlessness.

dans laquelle:

• ϑ est une assiette longitudinale courante de l'aéronef ;
• V est une vitesse courante de l'aéronef ; et
• k0, k1 et k2 sont des constantes prédéterminées.

According to the invention, in step a), said handle setpoint C is calculated using the following equation: $$\mathrm{VS}=k0+\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="imgf0001.png"\; state="\{\{state\}\}">k</figure-callout>}1*\cos \theta /V+\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="imgf0001.png"\; state="\{\{state\}\}">k</figure-callout>}2*\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="imgf0001.png"\; state="\{\{state\}\}">sin</figure-callout>}2\theta /{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="imgf0001.png"\; state="\{\{state\}\}">V</figure-callout>}}^2$$

in which:

• θ is a running longitudinal attitude of the aircraft;
• V is a running speed of the aircraft; and
• k 0 , k 1 and k 2 are predetermined constants.

• l'assiette longitudinale de l'aéronef est mesurée à l'aide d'au moins un capteur inertiel embarqué sur l'aéronef ; et
• la vitesse de l'aéronef est déterminée à l'aide d'au moins l'un des moyens embarqués suivants :
  • au moins un capteur inertiel ;
  • au moins un récepteur d'un système de positionnement par satellites ; et
  • au moins un capteur de pression ou de température.

In this preferred embodiment, advantageously:

• the longitudinal attitude of the aircraft is measured using at least one inertial sensor embarked on the aircraft; and
• the speed of the aircraft is determined using at least one of the following on-board means:
  • at least one inertial sensor;
  • at least one receiver of a satellite positioning system; and
  • at least one pressure or temperature sensor.

In addition, in a preferred embodiment, in step c), the scale is displayed vertically and said first and second indicators are displayed on either side of this vertical scale.

• déterminer et enregistrer, en temps réel, des valeurs de l'assiette longitudinale de l'aéronef, de la vitesse de l'aéronef et de la déflexion du manche, au cours d'au moins un vol parabolique réalisé par l'intermédiaire d'au moins l'une des opérations suivantes : au moins une simulation et/ou au moins un essai en vol ; et
• calculer lesdites constantes k0, k1 et k2 à l'aide des valeurs de l'assiette longitudinale, de la vitesse et de la déflexion du manche, ainsi enregistrées.

Furthermore, advantageously, said method comprises an additional step, prior to step a) and consisting in determining the constants k 0 , k 1 and k 2 by carrying out the following operations:

• identify and record, in real time, values of the aircraft's aircraft pitch, aircraft speed and aircraft deflection. during at least one parabolic flight performed by at least one of the following operations: at least one simulation and / or at least one flight test; and
• calculating said constants k 0 , k 1 and k 2 using the values of the longitudinal attitude, the speed and the deflection of the handle thus recorded.

The present invention also relates to a device for assisting the piloting of an aircraft during a parabolic flight of an aircraft in order to generate a weightlessness in the aircraft.

• une unité de calcul configurée pour calculer automatiquement une consigne de manche correspondant à une position optimale courante du manche pour réaliser le vol parabolique ;
• une unité de détermination de position configurée pour déterminer automatiquement une position effective courante du manche ; et
• une unité d'affichage configurée pour présenter sur au moins une échelle de positions de manche, affichée sur un écran du poste de pilotage, simultanément :
  • un premier indicateur représentatif de ladite consigne de manche, calculée par ladite unité de calcul ; et
  • un second indicateur représentatif de ladite position effective courante du manche, déterminée par ladite unité de détermination de position.

According to the invention, said piloting aid device is remarkable in that it comprises:

• a calculation unit configured to automatically calculate a stick setpoint corresponding to a current optimum position of the stick to perform the parabolic flight;
• a position determination unit configured to automatically determine a current effective position of the handle; and
• a display unit configured to present on at least one handle position scale, displayed on a cockpit screen, simultaneously:
  • a first indicator representative of said stick setpoint, calculated by said calculation unit; and
  • a second indicator representative of said current effective position of the handle, determined by said position determination unit.

• au moins un capteur inertiel ;
• au moins un récepteur d'un système de positionnement par satellites ; et
• au moins un capteur de pression ou de température.

In a particular embodiment, said piloting aid device further comprises a set of information sources, comprising at least one of the following sources of information:

• at least one inertial sensor;
• at least one receiver of a satellite positioning system; and
• at least one pressure or temperature sensor.

The present invention also relates to a manual control system for an aircraft, comprising a handle that can be actuated by a pilot to modify his position and configured to act on at least one elevator in order to generate control of the aircraft on the pitch axis as a function of the position of said handle, said manual steering system further comprising a steering assistance device such as the one mentioned above.

The present invention furthermore relates to an aircraft, in particular a transport aircraft, which is provided with such a steering assistance device and / or such a manual steering system.

The figures of the appended drawing will make it clear how the invention can be realized. In these figures, identical references designate similar elements.

The figure 1 is the block diagram of a driver assistance device which illustrates an embodiment of the invention.

The figure 2 schematically shows a manual steering system comprising a device for steering assistance.

The figure 3 schematically illustrates an example of display, which can be achieved by a steering assistance device.

The device 1 shown schematically on the figure 1 and to illustrate the invention, is intended to help control an AC aircraft, including a civil transport aircraft, during a parabolic flight to generate a weightlessness in the aircraft AC.

Parabolic flight is understood to mean a flight in which the aircraft AC is brought on a conventional trajectory of parabolic shape, making it possible to obtain a situation of weightlessness inside said aircraft AC, for a certain duration, generally of order of about twenty seconds. The method of calculating the parabolic trajectory making it possible to create the conditions of weightlessness is known and is not presented further in the present description.

The present invention applies to a flight performed manually by a pilot by acting on a conventional handle 2 of the aircraft AC, forming part of a manual steering system 3.

• le manche 2 usuel qui est apte à être actionné (en étant déplacé (pivoté) vers l'avant ou vers l'arrière) par un pilote pour modifier sa position (c'est-à-dire dans sa déflexion) et qui est configuré pour agir sur les gouvernes de profondeur 4 de l'aéronef AC, agencées sur les empennages horizontaux 5 de l'aéronef AC, dans le but de générer un pilotage de l'aéronef AC sur l'axe de tangage ;
• un calculateur 6 qui calcule, de façon usuelle, en fonction de la position du manche 2 (exprimée par un angle de déflexion) reçue par l'intermédiaire d'une liaison 7, un ordre de commande qui est transmis via une liaison 9 à un ensemble 8 d'actionneurs associés aux gouvernes de profondeur 4 de l'aéronef AC ; et
• lesdites gouvernes de profondeur 4 qui sont braquées par l'action des actionneurs associés, comme indiqué schématiquement par des flèches 10 en traits mixtes sur la figure 2.

As shown schematically and very broadly on the figure 2 , this manual control system 3 comprises:

• the usual handle 2 which is able to be actuated (by being moved (rotated) forwards or backwards) by a pilot to modify his position (that is to say in his deflection) and which is configured to act on the elevators 4 of the aircraft AC, arranged on the horizontal stabilizers 5 of the aircraft AC, for the purpose of generating a control of the aircraft AC on the pitch axis;
• a calculator 6 which calculates, in the usual way, as a function of the position of the handle 2 (expressed by a deflection angle) received via a link 7, a control command which is transmitted via a link 9 to a set 8 of actuators associated with the elevators 4 of the aircraft AC; and
• said elevators 4 which are steered by the action of the associated actuators, as indicated schematically by arrows 10 in phantom on the figure 2 .

Although the control system 3 is shown outside the aircraft AC on this figure 2 for reasons of simplification of the drawing, it is of course embedded on the latter.

In the context of the present invention, the control system considered may correspond to an electric flight control system, as shown in FIG. figure 2 , or a mechanical flight control system.

• une unité de calcul 11 qui est configurée pour calculer une consigne de manche C correspondant à une position optimale courante du manche 2 pour réaliser le vol parabolique ;
• une unité de détermination de position 12 usuelle qui est configurée pour déterminer la position effective (réelle) courante du manche 2 (comme illustré par une liaison 22 sur la figure 2), la consigne de manche et la position courante étant exprimée dans une même unité, par exemple en degrés représentatifs de l'angle de déflexion du manche par rapport à une position neutre ; et
• une unité d'affichage 13 qui est reliée, par l'intermédiaire d'une liaison 14 à l'unité de calcul 11 et par l'intermédiaire d'une liaison 15 à l'unité de détermination de position 12.

According to the invention, said flight control device 1 which is also on board the aircraft AC and which is part of the manual steering system 3 ( figure 2 ) has, as shown on the figure 1 :

• a calculation unit 11 which is configured to calculate a handle set point C corresponding to a current optimum position of the handle 2 to perform the parabolic flight;
• a usual position determining unit 12 which is configured to determine the current effective (actual) position of the handle 2 (as illustrated by a link 22 on the figure 2 ), the handle setpoint and the current position being expressed in the same unit, for example in degrees representative of the angle of deflection of the handle relative to a neutral position; and
• a display unit 13 which is connected via a link 14 to the calculation unit 11 and via a link 15 to the position determination unit 12.

• un premier indicateur 18 représentatif de ladite consigne de manche, calculée par ladite unité de calcul 11 ; et
• un second indicateur 19 représentatif de ladite position effective courante du manche, déterminée par ladite unité de détermination de position 12.

The display unit 13 comprises at least one screen 17 installed in the cockpit of the aircraft AC and it is configured to present on at least one scale 16 of handle positions, which is displayed on the screen 17, simultaneously as shown on the figure 3 :

• a first indicator 18 representative of said stick setpoint, calculated by said calculation unit 11; and
• a second indicator 19 representative of said current effective position of the handle, determined by said position determination unit 12.

In a preferred embodiment, shown in the figure 3 , the scale 16 is displayed vertically, and the indicators 18 and 19 are displayed on either side of this vertical scale 16. Such a display is very intuitive and can indicate directly to the driver whether to push or pull on the handle 2. However, another type of indicator display is also possible, for example with the two indicators displayed on the same side of the scale.

The indicators 18 and 19 are represented, for example, in the form of an arrow or a bar or any other graphic element, and have identical or different shapes and / or colors. In addition, the scale 16 can be graduated or not.

Thus, thanks to the invention, the handle setpoint (which illustrates an optimal position of the handle 2 to fly the AC aircraft on a parabolic flight to create a weightlessness) is calculated in real time and is adapted to the current situation of the AC aircraft, during the flight. This stick setpoint is provided to the pilot via the indicator 18, which thus indicates at any time, the position where the handle 2 must be brought to achieve optimal control of the aircraft AC.

In addition, since said stick setpoint depends solely on the speed and the longitudinal attitude, as specified below, it is almost insensitive to atmospheric disturbances and is not dependent on the quality of the measurement of the load factor. Therefore, the device 1 provides assistance to the pilot by indicating in real terms, directly, what action it must apply on its handle 2 to achieve the parabolic flight, thus minimizing parasitic actions that degrade the quality of the weightlessness.

The device 1 also comprises an assembly 20 of information sources which provide information to the calculation unit 11, via a link 21, and in particular the current values of parameters of the aircraft AC, in particular its speed and its attitude. longitudinal, as specified below.

dans laquelle :

• ϑ est l'assiette longitudinale courante de l'aéronef AC ;
• V est la vitesse courante de l'aéronef AC ; et
• k0, k1 et k2 sont des constantes prédéterminées.

In a preferred embodiment, the calculation unit 11 comprises calculation elements (integrated and not shown) for calculating said setpoint C, using the following equation: $$\mathrm{VS}=k0+\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="imgf0001.png"\; state="\{\{state\}\}">k</figure-callout>}1*\cos \theta /V+\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="imgf0001.png"\; state="\{\{state\}\}">k</figure-callout>}2*\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="imgf0001.png"\; state="\{\{state\}\}">sin</figure-callout>}2\theta /{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="imgf0001.png"\; state="\{\{state\}\}">V</figure-callout>}}^2$$

in which :

• θ is the current longitudinal attitude of the aircraft AC;
• V is the current speed of the aircraft AC; and
• k 0, k 1 and k 2 are predetermined constants.

These constants k 0, k 1 and k 2 depend on mass and aerodynamic characteristics of the aircraft AC, as well as a kinematics between the position of the handle 2 and the corresponding deflection of the elevators 4.

• l'assiette longitudinale ϑ de l'aéronef AC est mesurée, de façon usuelle, à l'aide d'au moins un capteur inertiel de l'aéronef AC, qui fait partie de l'ensemble 21 ; et
• la vitesse V de l'aéronef AC est déterminée à l'aide d'au moins l'un des moyens embarqués suivants qui font également partie de l'ensemble 21 :
  • au moins un capteur inertiel ;
  • au moins un récepteur d'un système de positionnement par satellites de type GPS ; et
  • au moins un capteur de pression ou de température.

In this preferred embodiment:

• the longitudinal attitude θ of the aircraft AC is measured, in the usual way, using at least one inertial sensor of the aircraft AC, which is part of the assembly 21; and
• the speed V of the aircraft AC is determined using at least one of the following onboard means which are also part of the assembly 21:
  • at least one inertial sensor;
  • at least one receiver of a GPS satellite positioning system; and
  • at least one pressure or temperature sensor.

Thus, the speed can be obtained by inertial sensors. A GPS type speed can also be used. Failing to have the speed in the terrestrial reference, it is also possible to use an aerodynamic speed obtained, in the usual way, from static and dynamic pressure measurements, as well as from the total temperature.

In the context of the present invention, the constants k 0, k 1 and k 2 are determined experimentally, either from simulation results, using a model of the dynamic behavior of the aircraft, or from from flight test results. For example, it is possible to ask a trained pilot to fly the AC aircraft in a parabolic trajectory (such as that to be used to obtain the desired weightlessness conditions), for example by using a conventional piloting method. acceleration, as usually practiced using a measurement of the vertical acceleration indicated to the pilot. The recordings made during this flight test provide some evolution of the deflection of the stick. From this curve, it is sufficient to adjust the coefficients k 0, k 1 and k 2 so that the instruction follows the average position of the handle 2 optimally. The value of the setpoint is calculated from the recorded values of the longitudinal attitude and the speed of the aircraft, during this test.

• déterminer et enregistrer, en temps réel, des valeurs de l'assiette longitudinale de l'aéronef, de la vitesse de l'aéronef et de la déflexion du manche, au cours d'au moins un vol parabolique réalisé par l'intermédiaire d'au moins une simulation et/ou d'au moins un essai en vol ; et
• calculer lesdites constantes k0, k1 et k2 à l'aide des valeurs de l'assiette longitudinale, de la vitesse et de la déflexion du manche, ainsi enregistrées.

Also, in summary, one can determine the constants k 0, k 1 and k 2, by carrying out the following operations:

• to determine and record, in real time, values of the longitudinal attitude of the aircraft, the speed of the aircraft and the deflection of the stick, during at least one parabolic flight made through at least one simulation and / or at least one flight test; and
• calculating said constants k 0, k 1 and k 2 using the values of the longitudinal attitude, the speed and the deflection of the handle thus recorded.

Therefore, the assistance provided to the pilot by the device 1 consists of an indication on the vertical scale 16 (via the indicator 18) of the optimum position of the handle 2 to be applied at all times during the flight along the trajectory parabolic. On the same scale 16 is represented the position current effective of the handle 2 (via the indicator 19). The piloting technique implemented by the pilot is then very simple. It consists of actuating the handle 2 so that the indicator 19 of current position of the handle 2 arrives opposite (at the same height for a vertical scale 16) of the position of the indicator 18 providing the instruction.

Claims (10)

1. Method for assisting the piloting of an aircraft (AC) during a parabolic flight in order to generate weightlessness in the aircraft (AC), said aircraft (AC) comprising a control stick (2) capable of actuation by a pilot to alter its position and configured to act on at least one elevator (4) so as to generate piloting of the aircraft AC on the pitch axis according to the position of said control stick (2), said method comprising a sequence of steps, carried out in an automatic and repeated manner, during a parabolic flight of the aircraft (AC) and consisting in real time in:

   a) computing a control stick command corresponding to an optimum current position of the control stick (2) for parabolic flight;

   b) determining an effective current position of the control stick (2); and

   c) simultaneously showing, on at least one scale (16) of control stick positions which is displayed on a screen (17) of the cockpit:

   - a first indicator (18) representing said control stick command computed in step a); and

   - a second indicator (19) representing said effective current position of the control stick (2), determined in step b),

   characterized in that in step a) said control stick command C is computed on the basis of the following equation: $$\mathit{C}=\mathit{k}0+\mathit{k}1*\cos \vartheta /V+\mathit{k}2*\sin 2\vartheta /{\mathit{V}}^2$$

   

   in which:

   - ϑ is a current angle of pitch of the aircraft (AC);

   - V is a current speed of the aircraft (AC); and

   - k0, k1 and k2 are predetermined constants.
2. Method according to claim 1,
   characterized in that the angle of pitch of the aircraft (AC) is measured by means of at least one inertial sensor on board the aircraft (AC).
3. Method according to one of claims 1 and 2,
   characterized in that the speed of the aircraft (AC) is determined by means of at least one of the following onboard means:

   - at least one inertial sensor;

   - at least one receiver of a satellite positioning system; and

   - at least one pressure or temperature sensor.
4. Method according to any one of the preceding claims, characterized in that in step c) the scale (16) is displayed vertically and said first and second indicators (18, 19) are displayed on either side of this vertical scale (16).
5. Method according to any one of the preceding claims, characterized in that it comprises an additional step, which precedes step a) and consists in determining the constants k0, k1 and k2 by carrying out the following operations:

   - determining and recording, in real time, values for the angle of pitch of the aircraft, for the speed of the aircraft and for deflection of the control stick, over the course of at least one parabolic flight performed by means of at least one of the following operations: at least one simulation and/or at least one flight test; and

   - computing said constants k0, k1 and k2 on the basis of the values for the angle of pitch, for the speed and for deflection of the control stick, thus recorded.
6. Device for assisting the piloting of an aircraft during a parabolic flight of an aircraft (AC) in order to generate weightlessness in the aircraft (AC), comprising a control stick (2) capable of actuation by a pilot to alter its position and configured to act on at least one elevator (4) so as to generate piloting of the aircraft on the pitch axis according to the position of said control stick (2), said device (1) comprising:

   - a computation unit (11) configured for automatically computing a control stick command corresponding to an optimum current position (2) for parabolic flight;

   - a position determination unit (12) configured to automatically determine an effective current position of the control stick (2); and

   - a display unit (13) configured to automatically show on at least one scale (16) of control stick positions which is displayed on a screen (17) of the cockpit, simultaneously:

   • a first indicator (18) representing said control stick command computed for said computation unit (11); and

   • a second indicator (19) representing said effective current position of the control stick (12), determined by said position determination unit (12),

   characterized in that said computation unit (11) is configured to automatically compute said control stick command C on the basis of the following equation: $$\mathit{C}=\mathit{k}0+\mathit{k}1*\cos \vartheta /V+\mathit{k}2*\sin 2\vartheta /{\mathit{V}}^2$$

   

   in which:

   - ϑ is a current angle of pitch of the aircraft (AC);

   - V is a current speed of the aircraft (AC); and

   - k0, k1 and k2 are predetermined constants.
7. Device according to claim 6,
   characterized in that it additionally comprises a set (20) of information sources, comprising at least one of the following information sources:

   - at least one inertial sensor;

   - at least one receiver of a satellite positioning system; and

   - at least one pressure or temperature sensor.
8. System for manually piloting an aircraft, said manual pilot system (3) comprising a control stick (2) capable of actuation by a pilot to alter its position and configured to act on at least one elevator (4) so as to generate piloting of the aircraft AC on the pitch axis according to the position of said control stick (2),
   characterized in that it additionally comprises a piloting assistance device (1) as specified in one of claims 6 and 7.
9. Aircraft,
   characterized in that it comprises a piloting assistance device (1) as specified in one of claims 6 and 7.
10. Aircraft,
    characterized in that it comprises a manual pilot system (3) as specified in claim 8.

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